[http://www.sheepwalkelectronics.co.uk/ Sheepwalk Electronics] have developed a series of expansion boards for the Raspberry Pi to interface your Raspberry Pi to a Dallas/Maxim 1-Wire network. The range includes a simple passive "master" (called the RPI1) to allow easy use of the kernel 1-Wire driver, a single channel I2C master based around the DS2482-100 (called the RPI2) and an 8 channel I2C master based around the DS2482-800 (the RPI3). The modules are now all available for sale on our website. We also sell a range 1-Wire slave boards including temperature and humidity sensors and I/O boards.

[http://www.sheepwalkelectronics.co.uk/ Sheepwalk Electronics] have developed a series of expansion boards for the Raspberry Pi to interface your Raspberry Pi to a Dallas/Maxim 1-Wire network. The range includes a simple passive "master" (called the RPI1) to allow easy use of the kernel 1-Wire driver, a single channel I2C master based around the DS2482-100 (called the RPI2) and an 8 channel I2C master based around the DS2482-800 (the RPI3). The modules are now all available for sale on our website. We also sell a range 1-Wire slave boards including temperature and humidity sensors and I/O boards.

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==== USB - RS232 TTL / I2C translator ====

==== USB - RS232 TTL / I2C translator ====

[http://electronics.cat/en/boards/set01_05/ set01_05] has three functions : 1st) translating USB to TTL Tx and Rx to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi], 2nd) converting USB to I2C and 3rd) supplying voltage to next board (it is not for 3Bpi) if jumper is between positions 1 and 2.

[http://electronics.cat/en/boards/set01_05/ set01_05] has three functions : 1st) translating USB to TTL Tx and Rx to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi], 2nd) converting USB to I2C and 3rd) supplying voltage to next board (it is not for 3Bpi) if jumper is between positions 1 and 2.

A high-end 24bit/192kHz DAC that connects to the I2S header. The board has RCA and phono jack line-level outputs with 2Vrms output, but does not need an external power supply.

+

+

http://www.hifiberry.com/dac/

+

+

==== HiFiBerry Digi ====

+

An S/PDIF output card for the Raspberry Pi. Features an optical and an isolated electrical output

+

+

http://www.hifiberry.com/hbdigi/

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==== Raspi-T-DAC ====

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http://www.tjaekel.com/T-DAC/raspi.html

===Arduino===

===Arduino===

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==== aLaMode ====

==== aLaMode ====

[http://wyolum.com/?p=824 “À la mode”] is an Arduino clone specifically designed to interface with the Raspberry Pi. You can of course connect a standard Arduino to a Pi USB port using a cord, but when you want a turnkey solution, how about an Arduino compatible “plate” (shield) that fits right on top of the Raspberry Pi with direct access to GPIO port? The Linux side handles all of the displays, human interfaces, and number crunching. The low power Arduino compatible “à la mode” board handles sensors, servos/motors, and provides a highly accurate real time clock.

[http://wyolum.com/?p=824 “À la mode”] is an Arduino clone specifically designed to interface with the Raspberry Pi. You can of course connect a standard Arduino to a Pi USB port using a cord, but when you want a turnkey solution, how about an Arduino compatible “plate” (shield) that fits right on top of the Raspberry Pi with direct access to GPIO port? The Linux side handles all of the displays, human interfaces, and number crunching. The low power Arduino compatible “à la mode” board handles sensors, servos/motors, and provides a highly accurate real time clock.

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==== ArduiPi ====

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The [https://hallard.me/arduipi-the-shield-that-brings-arduino-to-raspberry-pi/ ArduiPi] is a board that brings Arduino world to Raspberry Pi and vice-versa. It is totally open source Hardware and Software.

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The features are:

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* Power the Arduino side with Raspberry power or with external power.

+

* Selectable Arduino side power with 5V or 3.3V

+

* FTDI cable connector to be able to program Arduino independently leaving RX/TX of arduino and Raspberry free.

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* ICSP connector.

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* Power level shifter between Pi and Arduino for I2C, SPI, Serial, and all Pi V1 and V2 GPIO pins.

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* Raspberry Pi board Revision 2 with four new GPIO

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* I2C Bus available from Arduino AND/OR Raspberry Pi

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* I2C to 1-Wire controller on the board providing fully OWFS (or other) support for Raspberry Pi OR Arduino with dedicated library

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* Feature to connect I2C between Arduino And Raspberry Pi (Arduino will become a I2C slave from Raspberry Pi)

+

* Feature to connect SPI between Arduino and Raspberry Pi (Arduino will become a SPI slave from Raspberry)

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* Feature to connect the Arduino UART to Raspberry Pi Serial to do communication

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* Availability to use the French dedicated Téléinformation monitoring electricity signal issued from the main power meter to Arduino or Raspberry Pi

+

* Grove connector on board for I2C and Serial connection for Raspberry and Arduino

+

* Sized place to plug aAdafruit I2C or SPI Oled breakout board that can be driven by Arduino or Raspberry Pi in SPI or I2C

+

* Sized place to plug a NRF24L01 Wireless breakout board. Breakout board fitting this format will be available for RFM12B, RFM69W, SD card and SPI flash memory. This will let you use the majority of RF module used today

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* Sized place for 3 x 1-Wire devices on board.

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* Sized place for using PWM devices (switchable with on board power or external power)

+

* Two free pins available on level shifter chip for custom usage.

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Details, documentation and all others can be found [https://hallard.me/arduipi-the-shield-that-brings-arduino-to-raspberry-pi/ here]

[http://mikronauts.com Mikronauts] launches EZasPi - a prototyping board that stacks on top of the Raspberry Pi and was designed to make prototyping easier for educational users, and making one-off expansion circuits easier for everyone. EZasPi also has a four pin I2C expansion header, and a five pin COM connector for future expansion.

+

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Multiple EZasPi boards can be stacked on a single Raspberry Pi without the need for a bus or rack solution. The board has an extra large prototyping area that is silk screened to clearly indicate signal busses, and comes as a kit which includes an extra tall stacking header and mounting hardware that secures the board to the Raspberry Pi Rev.2 test mounting holes - keeping the board securely mounted on the Pi.

You can make a Pi Sandwich by stacking an EZasPi on top of your Raspberry Pi, and an EZasPi (B) under your Pi - with the mounting hardware securing your boards together.

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==== EZasPi (B) prototyping board ====

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[http://mikronauts.com Mikronauts] launches EZasPi (B) - the first prototyping board that stacks UNDER the rev.2 Raspberry Pi. EZasPi was designed to make prototyping easier for educational users, and making one-off expansion circuits easier for everyone. EZasPi (B) also has a four pin I2C expansion header for future expansion.

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Multiple EZasPi (B) boards can be stacked beneath a single Raspberry Pi without the need for a bus or rack solution. The board has an extra large prototyping area that is silk screened to clearly indicate signal busses, and comes as a kit which includes an extra tall stacking header and mounting hardware that secures the board to the Raspberry Pi Rev.2 test mounting holes - keeping the board securely mounted on the Pi.

You can make a Pi Sandwich by stacking an EZasPi on top of your Raspberry Pi, and an EZasPi (B) under your Pi - with the mounting hardware securing your boards together.

==== Pi Plates ====

==== Pi Plates ====

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you can power the boards with 12Volt, the board has a DIN rail container

you can power the boards with 12Volt, the board has a DIN rail container

http://www.progetti-hw-sw.it/raspberry.htm

http://www.progetti-hw-sw.it/raspberry.htm

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==== MiniPiio L293D ====

−

[http://zuzebox.wordpress.com/2012/09/07/minipiio-l293d-board-v0-10/ MiniPiio L293D] is a small (50x40mm) add-on board which provides a dual H-Bridge DC-Motor circuit using the venerable L293D chip. You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== MiniPiio Relay2 ====

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[http://zuzebox.wordpress.com/2012/09/07/minipiio-relay2-board-v0-10/ MiniPiio Relay2] is a small (50x40mm) add-on board which provides a two 1A DPCO Relays. Each relay has a set of screw terminals for easy wiring. You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== MiniPiio DIO16 ====

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[http://zuzebox.wordpress.com/2012/06/24/minipiio-dio16-v0-10/ MiniPiio DIO16] is a small (50x40mm) add-on board which provides an additional 16-channels of Digital Input/Outputs for the RPi. It can use either a MCP23S17 (SPI) or MCP23017 (I2C) Port Expander. You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== MiniPiio RS232 ====

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[http://zuzebox.wordpress.com/2012/06/24/minipiio-rs232-v0-10/ MiniPiio RS232] is a small (50x40mm) add-on board which provides a basic RS232 to TTL interface for the RPi. It uses a 3.3V MAX3232 to provide the RS232 interface. You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== MiniPiio ULN2803 ====

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[http://zuzebox.wordpress.com/2012/06/24/minipiio-uln2803-v0-10/ MiniPiio ULN2803] is a small(50x40mm) add-on board which connects a ULN2803 Darlington Driver chip to the RPi's GPIO allowing the RPi to control electronic circuits which require more current to drive them. You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== RPi MIDI Breakout Board ====

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[http://zuzebox.wordpress.com/2012/03/18/midi-breakout-board-for-raspberry-pi-v0-10/ RPi MIDI Breakout Board] is a simple MIDI breakout board for the Raspberry Pi using the hardware UART from the RPi's expansion interface. You can get these boards soon at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== RPi Protoboard SM====

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[http://zuzebox.wordpress.com/2012/06/25/raspberry-pi-protoboard-sm-v0-10/ RPi Protoboard SM] is a simple prototype board for the Raspberry Pi. Here is [http://www.designspark.com/knowledge/raspberry-pi-prototype-board-files another link] to the same project.

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You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== RPi "UserPort" ====

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[http://zuzebox.wordpress.com/2012/03/14/userport-for-raspberry-pi-v0-10/ RPi UserPort] is a digital and analogue I/O board for the Raspberry Pi. UserPort replicates the original BBC Micros digital User Port and Analogue Port but uses more modern components such as the MCP23S17 16-ch GPIO and MCP3204 4-ch 12-bit ADC.

====Slice of Pi====

====Slice of Pi====

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The Guzunty Pi adds open source programmable hardware to the Raspberry Pi at an amazingly low price. The design contains a 72 macrocell programmable logic device, so the board functions like a 'virtual breadboard'. This board is ideal for those with many different projects in mind, because it is so flexible. It can be a simple IO expander, a 7 segment LED driver, provide servo and regular PWM outputs, or anything you can dream up that will fit into 1600 logic gates. The device is '5 volt tolerant' and so can be used to safely interface 5v logic devices (such as Arduino) to the 3.3v Raspberry Pi. The [https://github.com/Guzunty/Pi/wiki GitHub community site] contains many ready made cores that you can download and use directly. You can design your own custom cores using industry standard languages such as VHDL or Verilog.

The Guzunty Pi adds open source programmable hardware to the Raspberry Pi at an amazingly low price. The design contains a 72 macrocell programmable logic device, so the board functions like a 'virtual breadboard'. This board is ideal for those with many different projects in mind, because it is so flexible. It can be a simple IO expander, a 7 segment LED driver, provide servo and regular PWM outputs, or anything you can dream up that will fit into 1600 logic gates. The device is '5 volt tolerant' and so can be used to safely interface 5v logic devices (such as Arduino) to the 3.3v Raspberry Pi. The [https://github.com/Guzunty/Pi/wiki GitHub community site] contains many ready made cores that you can download and use directly. You can design your own custom cores using industry standard languages such as VHDL or Verilog.

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==Expansion boards by manufacturer==

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==Expansion boards by manufactuer==

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This section has been moved to a separate page. See [[RPi Expansion Boards: Expansion boards by manufactuer]]

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=== dresden elektronik ===

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==== RaspBee ====

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The [http://www.dresden-elektronik.de/funktechnik/solutions/wireless-light-control/raspbee/?L=1 RaspBee] is an expansion board which brings ZigBee connectivity to the Raspberry Pi. The shield allows direct communication with ZigBee PRO devices like Philips Hue, XBee Series 2 and others.

The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/17/ADC-Pi-V2---Raspberry-Pi-Analogue-to-Digital-converter ADC Pi V2.1] is an 8 channel 17 bit analogue to digital converter designed to work with the Raspberry Pi platform. The ADC Pi V2.1 is based on two Microchip MCP3424 A/D converters each containing 4 analogue inputs with up to 18 bit resolution.

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====Delta-Sigma Pi 18 bit Analogue to Digital converter ====

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The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/14/Delta-Sigma-Pi-18-bit-Analogue-to-Digital-converter Delta-Sigma Pi] is an 8 channel analogue to digital converter designed for use on the Raspberry Pi computer platform. The board is based around the MCP3424 low noise and high accuracy 18 bit delta-sigma analogue to digital converter from Microchip Technology Inc. A pair of MCP3424 converters are included on the board along with an I2C buffer interface allowing you to connect additional 5V I2C devices to the same bus.

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====1-Wire Pi ====

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The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/27/1-Wire-Pi 1 Wire Pi] from AB Electronics is a communication board supporting the 1-Wire® protocol. A 5V buffered I2C port is also provided on the board.

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====Com Pi RS232 Serial and 1-Wire ====

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The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/26/Com-Pi-RS232-Serial-and-1-Wire Com Pi] from AB Electronics is a communication board supporting RS232 and 1-Wire® protocols. A 5V buffered I2C port is also provided on the board.

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====IO Pi 32 Channel Port Expander====

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The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/18/IO-Pi-32-Channel-Port-Expander-for-the-Raspberry-Pi-computer-boards IO Pi] is a 32 channel digital expansion board designed for use on the Raspberry Pi computer platform. The board is based around the MCP23017 16-bit I/O expander from Microchip Technology Inc. A pair of MCP23017 expanders are included on the board allowing you to connect up to 32 digital inputs or outputs to the Raspberry Pi.

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====RTC Alarm Pi Real time Clock Module ====

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−

The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/28/RTC-Alarm-Pi-Real-time-Clock-Module RTC Alarm Pi] is a real-time clock expansion board for the Raspberry Pi and is based around the PCF8563 Real-Time Clock IC from NXP. The PCF8563 is controlled via the I2C port on the Raspberry Pi and includes an interrupt based alarm output which can be set to pull high at a specified date and time.

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====RTC Pi Real time Clock Module ====

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The [http://www.abelectronics.co.uk/products/3/Raspberry-Pi/15/RTC-Pi-Real-time-Clock-Module RTC Pi] is a real time clock module which connects via the GPIO port on a Raspberry Pi.

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===Advamation===

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==== AdvaBoard RPi1 ====

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The [http://www.advaboard.de AdvaBoard RPi1] is a multifunctional extension-board, which contains:

Details can be found at [http://www.advamation.com/products/embeddedpc/advaboard.html www.advamation.com/products/embeddedpc/advaboard.html].

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More boards (e.g. additional displays, I/Os, motors, sensors etc.), which can be connected to the Raspberry Pi and/or the AdvaBoard RPi1 will also be available soon.

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===Pi Supply - Pi Cocktails===

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The following add on boards will shortly be available from [http://www.pi-supply.com Pi Supply] and are based on the Pi Cocktail series of boards explored in [http://themagpi.com The MagPi magazine]. More details to follow soon.

[http://electronics.cat/en/boards/set05_08/ set05_08 aka 3Bpi] translates bidirectionally inputs/outputs of the Raspberry Pi's GPIO from 3.3V to 5V TTL levels. It has three external ports to connect [http://electronics.cat/ electronics.cat] open source hardware boards. This board takes advantage of P5's Raspberry Pi, with access to a second I2C channel (I2C_0, it can be used without camera connected) and CTS and RTS for hardware flow control in serial communications. Two of 3Bpi's ports, P3 and P4, can be used as 8 bit input/output or I2C and/or SPI ports. One port, P2, is thought for serial communications and Raspberry Pi can be set as master or slave setting the jumpers properly.

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==== Relays Board ====

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[http://electronics.cat/en/boards/set05_02/ set05_02] is a 4 relays board to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi]. It can be expanded to another 4 relays board or an [http://electronics.cat/en/boards/set05_04b/ input board]

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==== Input Board ====

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[http://electronics.cat/en/boards/set05_04b/ set05_02] is a 4 inputs board to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi]. It can be expanded to another 4 inputs board or a [http://electronics.cat/en/boards/set05_02/ 4 relays board]

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==== LEDs + microswitch ====

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[http://electronics.cat/en/boards/set01_04/ set01_04] is a universal 8 bit inputs (microswitch) / outputs (LEDs) to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi]. Each bit is set as input or output through jumpers position.

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==== Digital Input / Output I2C expander ====

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[http://electronics.cat/en/boards/set03_03/ set03_03] expands 16 inputs/outputs using TWI (I2C) to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi]. Each board has two PCF8574. The lower bit is forced to a low level hardware (chip 1 A0 = 0 and chip 2 A0 = 1). Addresses A1 and A2 are set through SMD microswitch (SW1). The jumpers can notify if there is any change when reading, avoiding a constant reading of I2C bus. P1 and P2 connectors are designed to be connected in daisy chain up to four set03_03 boards (64 inputs / outputs).

[http://electronics.cat/en/boards/set01_05/ set01_05] has three functions : 1st) translating USB to TTL Tx and Rx to be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi], 2nd) converting USB to I2C and 3rd) supplying voltage to next board (it is not for 3Bpi) if jumper is between positions 1 and 2.

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==== uC Atmega ====

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[http://electronics.cat/en/boards/set01_01/ set01_01] is a microcontroller board with two 8-bit ports of inputs/outputs and one serial communication port. It is useful when it is needed to implement some real time application. It can be connected to [http://electronics.cat/en/boards/set05_08/ 3Bpi] using any port. Usually through serial communication port.

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===Pridopia ===

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This section has been moved to a separate page. See [[RPi Expansion Boards: Pridopia]]

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=== MSL Digital Soulutions ===

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==== RemotePi Board ====

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The [http://msl-digital-solutions.myshopify.com/ RemotePi Board] is an intelligent infrared remote controlled power switch add-on board for the Raspberry Pi. It allows to switch power on and off using any button (configurable in learning mode) of an existing standard IR remote. Power is only cut after notifying the OS and giving it time to shut-down. It is mainly intended to remote control (using LIRC) and power off/on a mediacenter system. i.e OpenELEC, Raspbmc, XBian.

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=== DTronixs ===

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You can get these boards at tindie.com in the [https://www.tindie.com/stores/DTronixs/ DTronixs store]

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==== MiniPiio L293D ====

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−

[http://zuzebox.wordpress.com/2012/09/07/minipiio-l293d-board-v0-10/ MiniPiio L293D] is a small (50x40mm) add-on board which provides a dual H-Bridge DC-Motor circuit using the venerable L293D chip.

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==== MiniPiio Relay2 ====

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[http://zuzebox.wordpress.com/2012/09/07/minipiio-relay2-board-v0-10/ MiniPiio Relay2] is a small (50x40mm) add-on board which provides a two 1A DPCO Relays. Each relay has a set of screw terminals for easy wiring.

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==== MiniPiio DIO16 ====

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−

[http://zuzebox.wordpress.com/2012/06/24/minipiio-dio16-v0-10/ MiniPiio DIO16] is a small (50x40mm) add-on board which provides an additional 16-channels of Digital Input/Outputs for the RPi. It can use either a MCP23S17 (SPI) or MCP23017 (I2C) Port Expander.

+

−

+

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==== MiniPiio RS232 ====

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−

[http://zuzebox.wordpress.com/2012/06/24/minipiio-rs232-v0-10/ MiniPiio RS232] is a small (50x40mm) add-on board which provides a basic RS232 to TTL interface for the RPi. It uses a 3.3V MAX3232 to provide the RS232 interface.

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==== MiniPiio ULN2803 ====

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−

[http://zuzebox.wordpress.com/2012/06/24/minipiio-uln2803-v0-10/ MiniPiio ULN2803] is a small(50x40mm) add-on board which connects a ULN2803 Darlington Driver chip to the RPi's GPIO allowing the RPi to control electronic circuits which require more current to drive them.

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==== RPi MIDI Breakout Board ====

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−

[http://zuzebox.wordpress.com/2012/03/18/midi-breakout-board-for-raspberry-pi-v0-10/ RPi MIDI Breakout Board] is a simple MIDI breakout board for the Raspberry Pi using the hardware UART from the RPi's expansion interface.

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==== RPi Protoboard SM====

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[http://zuzebox.wordpress.com/2012/06/25/raspberry-pi-protoboard-sm-v0-10/ RPi Protoboard SM] is a simple prototype board for the Raspberry Pi. Here is [http://www.designspark.com/knowledge/raspberry-pi-prototype-board-files another link] to the same project.

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==== RPi "UserPort" ====

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[http://zuzebox.wordpress.com/2012/03/14/userport-for-raspberry-pi-v0-10/ RPi UserPort] is a digital and analogue I/O board for the Raspberry Pi. UserPort replicates the original BBC Micros digital User Port and Analogue Port but uses more modern components such as the MCP23S17 16-ch GPIO and MCP3204 4-ch 12-bit ADC.

Introduction

On the Raspberry Pi, there are several connections which can be used for expansion:

The Rpi GPIO (General Purpose Input/Output) pins are exposed, that means that expansion boards are able to talk directly to the CPU.

The DSI connector will allow low-level interfacing with LCDs and other displays.

The CSI connector will allow camera modules to be added in future.

Expansion boards by functions

Alim / Power Supply and Control

Meltwater's Switched Mode Power Supply Kit

This is a DC to DC switched mode power supply, another great add on board in Meltwater's range. It comes as a kit of parts, ready to be soldered together. This can supply a 5 volt output to a Raspberry Pi from an input of anywhere from 7 to 40 volts!

Testing has shown that the unit is around 80% efficient, where a comparable linear regulator (such as LM350T) was measured under 50% (based on a quick test).

Pi Supply Switch

The Pi Supply Switch is an "intelligent" power management device for the Raspberry Pi made by Pi Supply. This add on board has hard on/off switches as well as a soft shutdown switch, which initiates a safe shutdown using a simple Python script. It allows you to cycle power on the Raspberry Pi without plugging and unplugging either your "wall-wart" power supply, or the micro-USB plug input to your Pi. It includes an LED status indicator, and 3 mounting holes for easy use in any project you have in mind. It needs only one GPIO pin to operate, with the option of using a second GPIO pin to add the safe shutdown functionality.

It is an Open Source project, and comes with free stickers and a free noodle USB cable to connect to your Pi.

RPI Alim

RPI Alim is a inexpensive board that gives the possibility of powering the Raspberry with a 7V to 15V DC power supply or battery.

RemotePi Board

The RemotePi Board is an intelligent infrared remote controlled power switch add-on board for the Raspberry Pi. It allows to switch power on and off using any button (configurable in learning mode) of an existing standard IR remote. Power is only cut after notifying the OS and giving it time to shut-down. It is mainly intended to remote control (using LIRC) and power off/on a mediacenter system. i.e OpenELEC, Raspbmc, XBian.

Protect & leds

Buffer Board

Buffer Board How to make a Pi Buffer on Veroboard. Each of the 14 outputs can drive up to 500mA using a Darlington array.

BerryClip 6 LED Buzzer Board

The BerryClip is a small board providing 6 coloured LEDs, 1 buzzer and 1 switch. It provides an easy and quick introduction to GPIO experimenting. The board plugs directly onto the Raspberry Pi GPIO connector and there are lots of Python example scripts available.
For a more detailed description see: BerryClip on Raspberrypi-spy.co.uk

LedBorg

LedBorg is an ultra bright RGB LED add on board for your Raspberry Pi. Capable of 27 colour combinations and controllable from either a GUI or the command line, it can also perform patterns.
Small board which connects directly to the GPIO header, Light up your case to suit your mood or display status information.

Meltwater's RGB LED Board

As well as a great blog, Meltwater also has a selection of add on boards, including a RGB LED board. This includes 5 bright RGB LEDs, and uses just 8 GPIO pins. The kit includes a pre-prepared strip-board, all the necessary components and cables, and a very complete full-colour manual with lots of code examples.

This is a great kit for learning how to use the GPIO on the Raspberry Pi, and make some pretty colours while you are at it!

GPIO isolated expansion/RTC

UT Electronics is developing a expansion board containing a fully isolated 16-I/O I2C GPIO expander and RTC, with extensive options for further expansion. C and Python libraries will be available at launch. The board will probably be sold as a kit, with SMT components already in place.

Update: According to their website, the realities of life prevent them from bringing the product to market. They are hoping someone will pick up the ball. They have released the PCB layout and all documentation for free on their website.

LEDs + microswitch

set01_04 is a universal 8 bit inputs (microswitch) / outputs (LEDs) to be connected to 3Bpi. Each bit is set as input or output through jumpers position.

Robotics/ motors

AFLEX Robotic Board

AFLEX Robotic Board is dual motor control and data acquisition board with I2C and Serial interfaces. The board provides 2 motor control drivers with max current up to 3.5A, 8-bits data port with each pin setup as digital input /output or analog input, 10-bits ADC with up to 5 analog channels, 4 inputs for the sensor connections, infrared (IR) remote control. The board provides direct connection to Raspberry Pi.

PiBorg

PiBorg is a Robotics add on board which adds the ability to control motors - from small to large (including DC motors, Stepper motors, BLDC motors and Solenoids) from your Raspberry Pi. It supports feedback via Encoders and Potentiometers, allowing closed loop (servo) control of motors to set positions, velocities and accelerations and it is capable of monitoring drive current and voltages. The loop is PID based and as PiBorg is an Open Source project, you may change the code as you please. It has the ability to drive 10A motors and more, so you'll never be left underpowered with this board!

PicoBorg

PicoBorg is an inexpensive add on board for controlling robotics such as small motors, fans, solenoids, LEDs and the like from the Raspberry Pi GPIO pins. It consists of 4 low side drivers and 4 diodes, and is hardware selectable for either using the Pi PWM output or only GPIO pins.

RPi Servo board

The Raspberry Pi Servo board by adent is a small expansion board for connecting up to eight RC servos and/or an ESC (Electronic Speed Controller) to the RPi. It has a pass through for the GPIO port and it uses the serial line in it for commands. The interface is a simple ASCII-protocol via the serial port. It also has five own GPIO-pins that is not supported by card firmware yet. Firmware is released as GPL. Can power RPi from ESC or external source.
Youtube clip of first prototype. Working on an alternate firmware to connect DHT22/11 humidity/temperature sensors to the board instead.

RPi SOFTWARE Servo board

The Raspberry Pi SOFTWARE Servo board by adent is a small expansion board for connecting up to eight RC servos and/or an ESC (Electronic Speed Controller) to the RPi. It has a pass through for the GPIO port. Can power RPi from ESC or external source.
It needs a kernel module to work. The card only buffers the GPIO of the RPi and
provides convenient connectors. Since there was room on the PCB, the serialport, GND and 3V3 is broken out.

XLoBorg

XLoBorg is a 3 axis accelerometer and 3 axis magnetometer which can be used as a compass and would be especially useful in UAV/drones. It plugs directly into the Raspberry Pi and requires no additional connections.

Home Automation

RPIDOM

RPIDOM is an inexpensive expansion board dedicated to home automation. It provides a 1wire interface, 2 teleinformation interfaces (french power meters), an RTC and a 5V connector.

Heber x10i

Heber Ltd X10i integrates real time I/O into a RPi control system. A secure real-time controller that permits control over multiple and different types of inputs and outputs, and uses the USB 2.0 communication standard. It is an all in one plug and play board for developing LED drivers, control, sensing of different switches, and driving stepper motors. Exclusive features include a real time clock, battery backed static ram, a Dallas chip (for unique board identification), 2 serial communication ports, a powerful audio amp and a independent dedicated on board processor.

Heber now offers drivers in C/C++ and Linux to make it even easier for programmers, inventors and developers to connect with the outside world using X10i and their Raspberry Pi.

Serial interfaces

Single and 8 Channel 1-Wire Masters from Sheepwalk Electronics

Sheepwalk Electronics have developed a series of expansion boards for the Raspberry Pi to interface your Raspberry Pi to a Dallas/Maxim 1-Wire network. The range includes a simple passive "master" (called the RPI1) to allow easy use of the kernel 1-Wire driver, a single channel I2C master based around the DS2482-100 (called the RPI2) and an 8 channel I2C master based around the DS2482-800 (the RPI3). The modules are now all available for sale on our website. We also sell a range 1-Wire slave boards including temperature and humidity sensors and I/O boards.

rpi_serial

BitWizard then has a series SPI (or I2C) expansion boards that can be daisy-chained off the SPI (or I2C) buses of the expansion board. A virtually unlimited number of expansion boards can be connected. Expansion boards are available that drive a simple 16x2 text LCD, more general purpose IOs, servos, temperature sensors, relays, optocouplers etc.

RS232 to TTL converter

USB - RS232 TTL / I2C translator

set01_05 has three functions : 1st) translating USB to TTL Tx and Rx to be connected to 3Bpi, 2nd) converting USB to I2C and 3rd) supplying voltage to next board (it is not for 3Bpi) if jumper is between positions 1 and 2.

Arduino

Arduino Shield and Raspberry Pi

aLaMode

“À la mode” is an Arduino clone specifically designed to interface with the Raspberry Pi. You can of course connect a standard Arduino to a Pi USB port using a cord, but when you want a turnkey solution, how about an Arduino compatible “plate” (shield) that fits right on top of the Raspberry Pi with direct access to GPIO port? The Linux side handles all of the displays, human interfaces, and number crunching. The low power Arduino compatible “à la mode” board handles sensors, servos/motors, and provides a highly accurate real time clock.

ArduiPi

The ArduiPi is a board that brings Arduino world to Raspberry Pi and vice-versa. It is totally open source Hardware and Software.

The features are:

Power the Arduino side with Raspberry power or with external power.

Selectable Arduino side power with 5V or 3.3V

FTDI cable connector to be able to program Arduino independently leaving RX/TX of arduino and Raspberry free.

ICSP connector.

Power level shifter between Pi and Arduino for I2C, SPI, Serial, and all Pi V1 and V2 GPIO pins.

Raspberry Pi board Revision 2 with four new GPIO

I2C Bus available from Arduino AND/OR Raspberry Pi

I2C to 1-Wire controller on the board providing fully OWFS (or other) support for Raspberry Pi OR Arduino with dedicated library

Feature to connect I2C between Arduino And Raspberry Pi (Arduino will become a I2C slave from Raspberry Pi)

Feature to connect SPI between Arduino and Raspberry Pi (Arduino will become a SPI slave from Raspberry)

Feature to connect the Arduino UART to Raspberry Pi Serial to do communication

Availability to use the French dedicated Téléinformation monitoring electricity signal issued from the main power meter to Arduino or Raspberry Pi

Grove connector on board for I2C and Serial connection for Raspberry and Arduino

Sized place to plug aAdafruit I2C or SPI Oled breakout board that can be driven by Arduino or Raspberry Pi in SPI or I2C

Sized place to plug a NRF24L01 Wireless breakout board. Breakout board fitting this format will be available for RFM12B, RFM69W, SD card and SPI flash memory. This will let you use the majority of RF module used today

Sized place for 3 x 1-Wire devices on board.

Sized place for using PWM devices (switchable with on board power or external power)

Two free pins available on level shifter chip for custom usage.

Details, documentation and all others can be found here
Schematics, PCB, sample code are on github

Raspberry Pi to Arduino Shields Connection Bridge

Raspberry Pi to Arduino Shields Connection Bridge allows you to use any of the shields, boards and modules designed for Arduino in Raspberry Pi. It includes also the possibility of connecting digital and analog sensors, using the same pinout of Arduino but with the power and capabilities of Raspberry. Using arduPi library, you will be able to make programs in Raspberry with the same code used in Arduino. To do so, Cooking Hacks Team have implemented conversion functions so that you can control in the same way as in Arduino all the I/O interfaces: i2C, SPI, UART, analog, digital, in Raspberry Pi.

Paper-Duino-Pi

Paper-Duino-Pi is an Arduino shield for the Raspberry Pi. Due to the fact that it is designed as Paper-PCB it is easy to create and one doesn't need a printed circuit board. All components are cheap standard electronic parts. A video is found here.

GELI 'jelly'(GPIO Experimenter and Lab Interface Board)

Pi Crust

picru.st is a very compact and cheap breakout board for your Raspberry Pi that allows easy access to the Pi's pins, grouping them into a logical order and adding clear labeling. Small and simple. Now available to purchase in kit form on Kickstarter here - Pi Crust Kickstarter

Piface

Piface is simpler than the RPi Gertboard (it's aimed at less experienced users), but also intended to connect to PCs and Android to be platform agnostic

EZasPi prototyping board

Mikronauts launches EZasPi - a prototyping board that stacks on top of the Raspberry Pi and was designed to make prototyping easier for educational users, and making one-off expansion circuits easier for everyone. EZasPi also has a four pin I2C expansion header, and a five pin COM connector for future expansion.

Multiple EZasPi boards can be stacked on a single Raspberry Pi without the need for a bus or rack solution. The board has an extra large prototyping area that is silk screened to clearly indicate signal busses, and comes as a kit which includes an extra tall stacking header and mounting hardware that secures the board to the Raspberry Pi Rev.2 test mounting holes - keeping the board securely mounted on the Pi.

You can make a Pi Sandwich by stacking an EZasPi on top of your Raspberry Pi, and an EZasPi (B) under your Pi - with the mounting hardware securing your boards together.

EZasPi (B) prototyping board

Mikronauts launches EZasPi (B) - the first prototyping board that stacks UNDER the rev.2 Raspberry Pi. EZasPi was designed to make prototyping easier for educational users, and making one-off expansion circuits easier for everyone. EZasPi (B) also has a four pin I2C expansion header for future expansion.

Multiple EZasPi (B) boards can be stacked beneath a single Raspberry Pi without the need for a bus or rack solution. The board has an extra large prototyping area that is silk screened to clearly indicate signal busses, and comes as a kit which includes an extra tall stacking header and mounting hardware that secures the board to the Raspberry Pi Rev.2 test mounting holes - keeping the board securely mounted on the Pi.

PiPLUS board also works as a bridge between Raspberry Pi and ARDUINO and provides a direct connection to Arduino Shields. You can use the standard ARDUINO environment and graphical interface for Windows or Linux for software development and ATMEGA328P microcontroller programming.

Pi Tin

Not yet tested, comments welcome
Project files for Eagle here: [2]
Schematic and Board images: [3][4]
This board uses Microchip 16-pin GPIO expanders driven by SPI to provide up to 256 additional GPIO pins at a very low cost. Optionally, it can supply power
for the board and the Raspberry PI.

The board can be made in a stackable manner allowing you to also place additional peripherals on the GPIO connector. It makes non-exclusive use of all
four SPI pins as well as exclusive use of the CE0 Pin.

If you install (and power) the power supply components, the board will supply up to 1A at 5VDC. This is not enough to power all GPIO pins on a fully populated board, but in most applications should be sufficient to power the RPI and a reasonable number of GPIOs. An external power supply should be used for higher-power applications. This board should never be powered from the RPI as even one of the chips can draw more than the RPI can provide.

The power supply is quite flexible and will accept anything from 8-25VAC or 8-42VDC. It is based on a Recom module which provides a switching power supply in a form factor that is a drop-in replacement for 7805 series TO-220 linear regulators.

The 8 chips can be had for about $4@ or less and the power supply components total about $15. A fully populated board is about $49+PCB, $31+PCB for 64 GPIO pins.

You can have the PCB made at a variety of fabricators. [5] does very nice work and is hobbyist friendly at very reasonable prices.

PiWeather - Raspberry Pi Weather Station Board

PiWeather RPi Weather Station Board is a small size RPi add-ons board. The board provides the temperature, pressure, humidity monitoring and controls the external devices (relays, high current LEDs ...).

Key Features:
Temperature, pressure and humidity sensors on the board; Two 1-Wire ports to connect the external temperature sensors DS18B20; Four high current outputs; Battery-backed Real Time Clock and Calendar; Small size - 2.1"x1.6" (53mm x 41mm).

Quick2Wire GPIO Interface Board Kit

Quick2Wire GPIO board and experimenters kit is an extension board for the Raspberry Pi that has level converters to allow the driving of TTL and real world devices such as LED's and switches. It will also provide an experimenters kit, a software framework and a number of tutorials. The Quick2Wire interface board is also available from Pi Supply.

Quick2Wire I2C PCF8591 Analogue Board

The Quick2Wire PCF8591 I2C Analogue Board has four 8-bit Analogue Inputs and one 8-bit Analogue Output. A simple Python API allows you to control the on-board PCF8591 chip and access all of its features for use with the Raspberry Pi. You can use the boards to measure four voltages and control one output voltage! - You can purchase from Pi Supply

Quick2Wire I2C MCP23017 Port Expander Board Kit

The Quick2Wire Port Expander board for the Raspberry Pi, gives you an extra 16 GPIO pins which can be used for digital input or output. You’ll find code in the Quick2Wire Library to drive it from Python, along with examples of use. - You can purchase from Pi Supply

Relay board and Raspberry Pi GPIO

Slice of Pi

Slice of Pi Ciseco have produced a convienient small break out board for the Raspberry PI. XBee style connector for XRF / XBee / RN-XV / XBT / RF-BEE etc. Has the SPI and I2C pins on one standard 8 way header and the Raspberry PI's 8 general purpose I/O pins on another for easy access. Comes as a kit of parts that needs to be soldered. Construction is very easy and suitable for children with basic soldering skills.

Slice of PI/O is a variation of the above produced by Ciseco based upon Nathan Chantrell's MCP23017/Slice of Pi "project". The MCP23017 may be powered from either the Pi's 3.3V/5.0V GPIO pins or, with care, an external psu. The use of a 5.0V power source means that the MCP23017's 16 (2 x 8) GPIO's can interface directly with 5V logic families etc. However, the Pi's own GPIO's, also available, will still need 3.3V - 5.0V level shifters. Trevor Gowen's experimental LED BarGraph "board" has been "piggy-backed" onto one of these.

TriBorg

XBee ZB SMT Backpack

The Raspberry Pi XBee ZB SMT Backpack by bootc is a carrier board for Digi XBee ZB SMT modules. These are different to the normal XBee modules because they are surface mount and additionally can interface to a host using SPI as well as serial. The backpack also features 3 LEDs for status signals as well as two FTDI headers (one for the RPi and one for the XBee), as well as being able to host a 'normal' XBee module (though of course you can't use SPI with those).

Raspy Juice Exp Board

Raspy Juice by 2-Watt Elements is an experimental board that supplies the Raspberry Pi with +5V through the GPIO header. With its wide input voltage range (6~23V), the buck regulator can be powered by batteries, 12V Adapters, solar, etc. Other features are the RS232 level console port, PCF8523 RTC, and an expansion ATmega168A microcontroller as an I2C slave. This latter MCU has interfaces of an RS485 port, an additional RS232 port, 4 RC-servo ports and unused-pins expansion header. The MCU firmware is updateable through the I2C interface. Hardware details are in http://code.google.com/p/raspy-juice/wiki/1_Hardware_Description

pyMCU

pyMCU is a python controlled microcontroller that works with the Raspberry Pi, connects to the USB port and uses the pyMCU python module and pyserial to control the microcontroller in your python script. You can communicate with i2c, spi, serial, and one wire devices, software configurable pulse in / out functions, has 13 Digital IO Pins, 6 10-bit Analog Pins, 5 10-Bit PWM Pins, blink LEDs, control servos and motors, read various sensors, built-in functions for sound generation: arbitrary frequency generator, misc. sound / tone generator, DTMF generator. PyBootloader - python script for uploading new firmware versions or your own microcontroller code. Check out some of the Tutorials and Examples

RPi CC1101-OneWire-Clock extension

The RPi-COC board from busware.de adds Onewire, a Sub-1 GHz RF Transceiver, RTC and an EEPROM mainly for smart home automation. The Onewire RJ11 port is driven by a DS2482 chip supported by 5V levelshifter and strong pullup. The DS1339-RTC is powered by CR2032 battery or on-board 60mF supercap. The 2Kbit EEPROM (at24c02) is mainly to hold board specific config data. The CC1101 Sub-1 GHz RF Transceiver is controlled by an atmega1284 to pre-process air data. It is connected to RPis UART and contains a avr109-bootloader for firmware updates. The popular culfw-firmware lets you interact with FS20, Homematic, Intertechno or similar actors and sensors - easily using FHEM-home automation server. In addition a secured 5V power socket for external power supplies is provided.

RFM12Pi - Wireless OpenEnergyMonitor Base-station

Add's RFM12B wireless (868/433/912Mhz) RF transceiver capability to the Raspberry Pi. The RFM12Pi decodes RFM12B packets from OpenEnergyMonitor sensor modules or JeeNodes and puts the data on the Raspberry Pi's internal serial UART. Designed to be used with emoncms running on a Raspberry Pi web-server to make a low power energy, temperature and other environmental data logging and visualisation server. Developed as part of the OpenEnergyMonitor project. For more info see introductory blog post and overview documentation page. The RFM12Pi can be purchased pre-assembled and ready to go from the OpenEnergyMonitor shop

3Bpi - Three Branch Pi - Level translator board for Raspberry Pi

3Bpi, aka set05_08, translates bidirectionally inputs/outputs of the Raspberry Pi's GPIO from 3.3V to 5V TTL levels. It has three external ports to connect electronics.cat open source hardware boards. This board takes advantage of P5's Raspberry Pi, with access to a second I2C channel (I2C_0, it can be used without camera connected) and CTS and RTS for hardware flow control in serial communications. Two of 3Bpi's ports, P3 and P4, can be used as 8 bit input/output or I2C and/or SPI ports. One port, P2, is thought for serial communications and Raspberry Pi can be set as master or slave setting the jumpers properly.

Programmable

Guzunty

The Guzunty Pi adds open source programmable hardware to the Raspberry Pi at an amazingly low price. The design contains a 72 macrocell programmable logic device, so the board functions like a 'virtual breadboard'. This board is ideal for those with many different projects in mind, because it is so flexible. It can be a simple IO expander, a 7 segment LED driver, provide servo and regular PWM outputs, or anything you can dream up that will fit into 1600 logic gates. The device is '5 volt tolerant' and so can be used to safely interface 5v logic devices (such as Arduino) to the 3.3v Raspberry Pi. The GitHub community site contains many ready made cores that you can download and use directly. You can design your own custom cores using industry standard languages such as VHDL or Verilog.